Stephen Colbert signs petition to close the prison at Guantanamo Bay.

Rosanne Cash appeared on the Colbert Report last night to go toe-to-toe with Stephen Colbert on the use of music to torture at Guantanamo, and Rosanne made it clear: using music as torture is wrong and there’s no gray area. The upshot? Colbert signed our campaign letter agreeing with General Colin Powell that Guantanamo “should be closed this afternoon.” Since this is Colbert we’re talking about, he claims he signed it to “make it harder for Obama.” But we’ll take it.